02 vaneo 1.7 cdi air con compressor

[redders33]

Hello all , the clutch / pulley on my air con compressor is noisey and causing the belt to run erratically. If I spray it with wd 40 the noise goes but soon comes back. Can I buy just the clutch or do I have to buy the whole compressor? also can I fit a belt from a none air con model and take the compressor off and get a replacment at a later date ( they not cheap ) thanks Nick